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(No Model.)

L.:W. SUTTON, Jr. RECEIVING TELEPHONE.

Patented" Jan. 8, 1884.

INVENTOR WITNESSES ATTORNEYS.

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ilNiTnn STaTas PATENT FFICE.

LYMAN W. SUTTON, JR, OF NEWVTON, ASSIGNOR TO JOHN F. PHILLIPS, OF JERSEY CITY, NEWV JERSEY.

RECEIVING-TELEPHONE.

SPECIFICATION forming part of Letters Patent No. 291,802, dated January 8, 1884.

Application filed February 15.1883. (No model.)

To all whom it may concern:

Be it known that I, LYMAN W. Surrox, J11, of Newton, in the county of Sussex and State of New Jersey, have invented a new and useful Improvement in ReceivingTelephones; and I do hereby declare that the following is a full, clear, and exact description of the same.

My invention relates to receiving-telephones used in connection with battery-transmitters.

The four figures of drawings are longitudinal sections, showing my invention.

In Figure 1 a tube, A, of non-magnetized material, but capable of being magnetized, and

having the same diameter as the central aperture of the mouth-piece B, is secured to the back of the mouth-piece by a flange, a. In Fig. 1 of drawings a helix, G, surrounds the tube A throughout its entire length, and its terminals are connected with binding-posts I) Z), secured to the sides of the mouth-piece. A hollow handle, D, secured to the back of the mouth-piece B, incloses the helix 0 and the tube A. This tube is made so thin as to be readily acted on by the primary or secondary current. WVhen a current from a battery is sent through the helix 0 and interrupted or varied, the tube A, by virtue of molecular changes induced by the magnetic action of the current in the helix, becomes suddenly longer or shorter, according as the current passes or ceases, and sounds are produced which proceed from the mouth-piece B. The portion c of the inner end of the tube A is not covered by wire, and the fixed magnet E is secured to the end of the handle D with both poles in close proximity to the side of the tube, but not touching it. The effect of the permanent magnet E cl is to cause the tube A to vibrate laterally as its coil 0 is acted on by alternating currents from an inductioncoil. The lateral movement of the tube supplements the longitudinal vibration and aug- 4 5 ments the sound produced by the instrument. In the receiving-telephone shown in Fig. 2 a short tube, A, is attached to the inner surface of the mouth-piece D by means of a flange, c. There is a transverse slit, 0, in the tube A, near the flange a, and a longitudinal 5o slit, (2, extending from a point near one end of the tube A nearly to the opposite end in the lower side of the tube. Apermanent U- magnet, E, having one arm longer than the other, is attached by its longer arm to the back of the mouthpiece 13, while its shorter arm is near the inner end of the tube A and axially in line with it. To the longer arm of the permanent magnet E, and extending toward but not touching the middle of the tube A, is apolar extension, 6, surrounded by a coil, 0, whose terminals connect electrically with the binding-posts b b. XVhen an interrupted or varied current traverses the coil 0, the magnetic conditions of the polar extension 0 is changed, so that the armature is alternately attracted and released, and the slit (1, which is opposite the polar extension 0, is partly closed and permitted to open, thus giving to the tube a compound movement,

consisting oi'lateral vibrations and changes of diameter, and either of these movements may be utilized without the other by dispensing with one or the other of the slits c d.

The receiving-telephone shown in Fig. 3 is substantially the same as that shown in Fig. 2, the principal difference being that the slit d is dispensed with and the permanent U- magnet E has one of its poles in contact with the tube A at or near the mouth-piece B, So while its other pole is near the middle of the tube A, but not in contact with it, and this pole is surrounded by the coil 0. In this form of receiver the tube vibrates laterally. The modification shown in Fig. 4 differs from that shown in Fig. 3 in having the coil 0 located on the tube A near the mouth-piece end, instead of on one of the poles of the permanent magnet. In this case a reed, f, of iron or steel, attached to the inner end of the tube 0 A, and extending through the tube toward the mouthpiece, and bent downward toward the lower side of the tube, augments the sound by the addition of its vibration to that of the tube A. 5

In the instruments shown in Figs. 2, 3, 4

the tube A is polarized by contact with or i open at both ends, a magnet, and a helix, all proximity to the permanent magnets, and in in inductive relation to each other, substanconsequence they are more sensitive to the tially as described.

current than the receiver shown in Fig. 1. LYMAN WV. SUTTON, JR. 5 What I claim is- WVitnesses:

A magneto-electric telephone consisting of I GEO. M. HOPKINS,

EDW. M. CLARK.

the combination of a resonant magnetic tube, 

